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Test fixes for consistent pass rates under repeated runs (-count=N): Global state isolation: - appc: check metric deltas instead of absolute values - cmd/derper: initialize DNS caches before test - tsweb/varz: use unpublished expvar to avoid global registration - wgengine/netstack: check metric deltas instead of absolute values - net/dns: use SetForTest() with deferred restore for hooks Timeout and concurrency: - cmd/containerboot: increase wait loop timeouts for parallel load - tsconsensus: add deadline to waitFor(), use sync.Once for netns - tstest/integration: add tstest.Shard/Parallel, fix IPN bus watchers - net/netcheck: set testCaptivePortalDelay to prevent hangs - wgengine/magicsock: use Port:0, add timeout to callback wait - drive/driveimpl: use http.Server for proper shutdown Race conditions: - tstest/archtest: remove !race from build constraint - util/deephash: use local sink variable instead of package-level - net/art: switch to math/rand/v2 for thread-safe globals - tstest/integration: use Status() instead of MustStatus() from goroutines Test optimization: - net/udprelay: rewrite VNI test to avoid iterating all 16M values - ipn/ipnlocal: reset env vars between subtests - cmd/containerboot/serve: use SetWaitDurationForTest - tsnet: wait for service VIP in AllowedIPs before dialing Change-Id: Id6186fb8a45031920550a208ded77382e57cc016 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>